Information on the most widely used ASTM standards within the materials testing industry
ISO 13426-1:2019 Geotextiles and geotextile-related products — Strength of internal structural junctions — Part 1: Geocells
ISO 13426-1 test describes index test methods for the determination of the strength of internal structural junctions of geocells under different loading conditions.
Splitting test procedure:
All test methods are performed at a constant strain rate of 20 mm/min.
At the beginning of the test, adjust the distance between the jaws to ±3mm of the required specimen length.
The specimen is mounted in the center of the jaws. Note that the length of the specimen should be parallel to the direction of the force.
Start the pull machine and continue until the sample is destroyed. Stop the device, record and report the maximum load with an accuracy of 2% of the full-scale reading. Reports the corresponding displacement in millimeters, with one decimal place reserved.
A geocell junction can fail in four different ways:
| Tensile shear test | ![]() |
| Peeling test | ![]() |
| Splitting test | ![]() |
| Local overstressing Test | ![]() |
1) by shear : when failure is caused by a force parallel to the junction itself;
2) by peeling or delamination : when failure is caused by a force, normal to the junction, which separates the cells from each other at one edge of the junction;
3) by splitting: when a force, normal to the junction, pulls away the two cells adjacent to the junction;
4) by local overstressing: when the fixation element locally overstresses the junction, leading to a compression, shear or peel failure.

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